Only quote that which you want to directly respond to. Anything else has already been typed and available in the thread to read by everyone. Quoting too much makes the thread cumbersome and hard to scroll through.

I'm seeing this more and more and it's a very lazy way to respond to someone else's points and it takes up valuable vertical space in the thread. You need to break up the points you want to respond to and take the time to do it right and respond to the individual points - not an entire big block of nested quotes. There is no reason to re-post everything again as it is already in the thread for people to read.

Break up the points or just say - Mr. Smith, I respond to your previous points as follows ...

Take more time and break up these Big Blocks. I'm going Big Block hunting for these today and I'll be inserting modbreaks wherever I see them.